Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15SR
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15SR is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 15mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke15 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionFixed TPU bumper pads
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15SR
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty work in a compact footprint. The stainless-steel barrel and rod shrug off mild corrosion, making it superior to painted alternatives in damp or washdown settings. It features a 1/4" port and an R axial-in rear cover for straightforward plumbing.
With a short 15 mm stroke and fixed TPU bumper pads to absorb end-of-travel impacts, it excels in rapid clamping tasks. Plan for roughly 377 N of actual work at 0.5 MPa to ensure longevity, which translates to lifting about 32 kg vertically with a safe 2:1 margin. The built-in magnet (-S) directly supports CMSG, DMSG and EMSG switches.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15SR Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15SR |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 15 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Fixed TPU bumper pads |
| Max standard stroke | Up to 500 mm |
Specifications follow the official AirTAC MI/MIC (ISO 6432) datasheet. Barrel & rod: stainless steel (round-body, riveted construction). Thread options: PT (blank) / G. Note: the Ø40 bore is a larger, non-ISO-6432 size.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | 739 N |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15SR
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×15 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSG / DMSG / EMSG sensors. |
MI-family variants: MI / MIC (double acting ±cushion), MSI / MTI (single acting push / pull), MID / MICD (double rod ±cushion), MIJ / MICJ (adjustable stroke ±cushion). Back covers CA / U / R / CM. Mounting LB / FA / SDB / TC.
Where the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15SR Is Used
Heavy-Duty Stamping
Provides the robust 628.3 N push force needed to stamp or emboss thick metal tags and plates within a tight 15 mm travel.
Short-Stroke Pressing
Ideal for pressing bearings or pins into housings on an automated line, using its fixed TPU bumpers to absorb the sudden impact.
Pallet Stopper Gate
Acts as a high-force physical stop gate on a conveyor to halt heavy pallets, with the stainless build resisting dust and moisture.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15SR the Right Cylinder?
As the largest bore in the MI family, there is no larger standard size to step up to; if 628.3 N at 0.5 MPa is insufficient, you would need a different cylinder series entirely. Stepping down, the Ø32 bore provides 402.2 N of push force, offering a smaller footprint if you have over-specced the force. Because this SKU includes the -S magnet, it is fully ready for CMSG, DMSG or EMSG position sensing. You can mount it using LB foot, FA flange, SDB pivot or TC trunnion brackets.
Remember that the fixed TPU bumpers only decelerate the piston near the stroke end; they do not act as a brake. If your application must maintain vertical position during air loss or valve centering, the rod will drift, so you must fit an external rod lock or a pilot-operated check valve.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G)
- ✓ Magnet (-S) for sensors?
- ✓ Back cover (CA/U/R/CM) & mount (LB/FA/SDB/TC)
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Do not dismantle the riveted front/back covers.
- check Use correct back cover (CA/U/R/CM) & mount (LB/FA/SDB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15SR FAQ
This 40 mm bore cylinder features a 1/4" port and a 16 mm rod. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, increasing to 879.6 N push and 738.9 N pull at 0.7 MPa. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
Yes, the -S suffix means it has a built-in magnet for CMSG, DMSG and EMSG switches. However, it uses fixed TPU bumper pads for deceleration only; it will not hold a load if air is lost. You need an external rod lock or pilot check valve for position holding.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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